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I'm afraid you can't reduce needed
sample rate for a fixed bandwidth.
You need a stronger laptop. Often,
plugging it into mains power helps.
Marcus
On 31.03.2014 17:52, Nasi wrote:
> ohhh, now I understand. It
produces UUUU in the transmitter
side -
> which probably means underflow
with my laptop. Do you know how to
> decrease this power?
>
>
>
> Mon, 31 Mar 2014 08:44:49 -0700
(PDT) ?? Bogdan Diaconescu
> <
address@hidden>:
>> For dvbt the bandwidth is
around 9.14Msps so with the rational
>> resampler you need to
set-up the USRP at 10Msps. 1Msps
will not
>> work as only a part of the
spectrum will be received.
>>
>> Bogdan
>>
>>
>> On Monday, March 31, 2014
6:36 PM, Nasi <
address@hidden>
>> wrote: Hi,
>>
>> Thanks!
>>
>> I am using collected data
also as
> you say.
>> I am using sampling rate of
1 Mbps instead of 10 Mbps which must
>> be the same for static
transmission. Isn't it?
>>
>>
>>
>>
>> Mon, 31 Mar 2014 08:23:01
-0700 (PDT) ?? Bogdan Diaconescu
>> <
address@hidden>:
Hi, not having access to my setup
for
>> now but for the beginning
you could try recording the spectrum
>> with your USRP and then use
the file source to decode the signal
>> offline. There is a script
file apps/capture.sh that I usually
>> use to capture data. You
may tweak it for your needs
(frequency,
>> gain).
>>
>> Sometimes it was reported
that on old cpus the processing
power
>> is not enough so that the
result is an overflow (you directly
see
>> a long OOO message in this
case). Try to see if this is the
>> case.
>>
>> One way to reduce the
overhead is to run the receiving
flow
>> directly from command
> line instead of
gnuradio-companion (e.g. ./top_block
> out.txt)
> after you have generated the
flowgraph. The gnuradio-companion
> cannot cope with big amount of
data when the blocks gets out a lot
> of text.
>>
>> Bogdan
>>
>>
>> On Monday, March 31, 2014
1:22 PM, Nasi <
address@hidden>
>> wrote: Hi all,
>>
>> I am using ubuntu 13.04,
GNURADIO 3.7. I cannot transmit or
>> receive using two (USRPN200
+ XCRV2450 d.board+VERT2450
antennas)
>> devices for DVB-T project.
Here is the dvb-t project:
>>
https://github.com/BogdanDIA/gr-dvbt
>>
>> It will be very helpful and
appreciated if you help me. If
>> someone tested it or can do
it, please let me know. As far as I
>> know someone tested it with
N210 model.
>>
>> I think this failure is due
to high noise/interference or smt.
>> else. However I tested it
already with all possible
>> configurations. I also
attach my .grc files.